[test] paralellize db tests

Ref: #238, #341, #418
4 jobs for 238-dev-async-job-worker in 57 minutes and 40 seconds (queued for 13 minutes and 16 seconds)
Status Job ID Name Coverage
  Cabal
passed #15921
cabal

00:20:49

 
  Stack
passed #15922
stack

00:10:56

 
  Bench
manual #15923
allowed to fail manual
bench
 
  Test
passed #15924
test

00:25:54